-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Two steps are required to cryptographically verify image integrity. 1. By verifying the integrity of this signature file, you can be sure that the checksums included in this file are valid. $ gpg --keyserver hkp://pool.sks-keyservers.net --recv-keys 0xA16EB94D $ gpg --list-keys 0xA16EB94D pub 2048R/A16EB94D 2008-08-15 [expires: 2023-08-12] uid Turnkey Linux Release Key $ gpg --verify turnkey-punbb-14.0-jessie-amd64.iso.sig gpg: Good signature from "Turnkey Linux Release Key" 2. By calculating the image checksum and validating the hashed value is the same as listed below, you can be sure the image was not corrupted in transit or tampered with. $ md5sum turnkey-punbb-14.0-jessie-amd64.iso 364da9451a682567c9881237160ee9b0 $ sha1sum turnkey-punbb-14.0-jessie-amd64.iso c4fb4f715c7d9fcbfd10c4a67cc0f9163866fe68 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV7BrqAAoJEIXCXpWhbrlNV2YH/0x2NhaW9/MtKRu3qu8VUeIg ePBGug8MAsSwRFZMXzrec8+4BuKnXngQ8hU3jx7fJA445yCfMswZStUO1jNuV5/w hgbglMMyGD465wTQ466LkXHgLP0nb5weO4Lz/Rw30tqm8G2vTlTCj8/WMkXBnFj2 0FIPd0eOW0zVNHGsuikTrvcguPGfthsqG4icb3d6xUbm1JaxPtfDdxPbdgCKLptk ggMu74IgRqMmt02Z4J0BEHSge9It22I65q7QS2zSszaEVn51GSbOK/hSU3c88ZRO bsmg5yiqninl5k6IKE7upS+3UAMVTViAqkf0pp2CWokbKvp1ZfalGjOZZB7hRoY= =WDCT -----END PGP SIGNATURE-----